emp is a localized effect. a nuke detonated over the midwest would cover a siable portion of the US, but wouldn't affect anything outside that area.

but it would render EVERYTHING electronic unusable - modern vehicles, phones, medical devices, toys, etc. we would truly be back to the 1800s, but without the society or skills to survive in that era. it would be a disaster of epic proportions - disease, starvation, murder.

Pretty scary stuff. I personally would get mirrors lots of mirrors and a crock pot